639067696 has 40 divisors (see below), whose sum is σ = 1309782240. Its totient is φ = 301441536.

The previous prime is 639067691. The next prime is 639067753. The reversal of 639067696 is 696760936.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (639067691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14970 + ... + 38758.

It is an arithmetic number, because the mean of its divisors is an integer number (32744556).

Almost surely, 2^639067696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639067696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (654891120).

639067696 is an abundant number, since it is smaller than the sum of its proper divisors (670714544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639067696 is a wasteful number, since it uses less digits than its factorization.

639067696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23893 (or 23887 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 52.

The square root of 639067696 is about 25279.7882902527. The cubic root of 639067696 is about 861.3552168066.

The spelling of 639067696 in words is "six hundred thirty-nine million, sixty-seven thousand, six hundred ninety-six".